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Watch Later 17:49

二數 - 方向

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四下B第十四課對稱圖形一（第二堂）

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四下B第十四課對稱圖形一（第一堂）

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小數的應用

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小數的認識(二)

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小數的認識(一)

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圓周的計算(二)

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圓周的計算(一)

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圓周的認識

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